I submitted. And to my surprise, got an auto-responder with the following:

"Thanks so much for your inquiry about Path on Windows Phone. We'd love to have Path on as many platforms as possible over time. Windows Phone in particular is one that quite a few people have been emailing us about. I'm going to record your request into our system and we'll let you know if a version becomes available in the future."

Either they have a sweet little note for every platform, or they are genuinely getting a lot of WP requests. Either way, the more the merrier, so start sending those requests :-)